Gear box



June 17, 1930. R. E. CIDELEVOYE 1,765,133

GEAR Box Filed Feb. 14, 1929 a Sheets-Sheet 1 I Jul/67 12221 Boxer-Zflaflelevo y 1 W i.

June 17, 1930. R. is. c.- DELEVOYE 1,765,133 I GEAR BOX Filed Feb. 14, 1929 3 Sheets-Sheet 2' eE-ZZ'orneys I Patented June 17, 1930 1' UNITEDSTATES PATENT oFF1c1 ROBERT EMILE CHARLES DELEVOYE, 0F ?AE1S, FRANCE,ASSIGNOR TO SDGIETE ANONY'ME DES ANCIENS ETABLISSEMENTS HOTCHKISS800113., OF ST.-DEN1S, SEINE, FRANCE, A JOINT-STOCK COMPANY OF FRANCEGEAR BOX Application filed February 14, 1929, Serial No. 339,869, and inFrance January 14, 1929.

The present invention relates to improve.- ments in gear boxes, forexample, for motor vehicles, said improvements being more particularlyapplicable, however, to gear boxes of the kind which include, inaddition to other parts, a double set of internally toothed gears. As iswell known, this arrangement, which enables one of thespeeds to beobtained solely by means of internally toothed gears, is veryadvantageous on account of the silence and strength of the transmission.Its use, however, entails making the gear boxes comparatively large andheavy. WVith the present invention, on the contrary, it is possible toobtain an internally toothed gear box of this character, of reduced bulkand weight and yet of sturdy construction. The gear box comprises, inthe usual manner, a driving and a driven shaft, arranged preferably inalignment, countershafts parallel tothe above mentioned shafts, slidinggears and pinions corresponding to each of said shafts, and it isessentially characterized by the fact that it includes a hollow fixeddrum located eccentrically relative to the driving and driven shaftswhich may rotate within said drum on which the sliding gear, meshingwith said driving and driven shafts, is supported.

According to an advantageous form of construction, the above mentioneddrum, which is fixed at one end to the corresponding iiange of the gearbox casing, is, supported at, its other end by the driven shaft or itsextension. A hearing in which said shaft can rotate, is provided, tothis effect, in the end of the drum. This form of construction isparticularly adapted to the case in which the driven shaft, or itsextension, can rotate at one end in a corresponding bore formed in thedriving shaft which thus acts a's'a'journal therefor.

The drum includes a cut away portion whereby the driving pinion, whichis fashioned as usual at the end of the driving shaft, canengage withtheinternal teething of the sliding gear mounted on the drum and withthe auxiliary pinion or pinions,

According to the invention, the sleeve for obtaining directdrive (whichcan slide in the usual manner on the driven shaft) is displaced throughthe medium of the sliding gear mounted on the drum, said sliding gearthus acting as a controlling member in: addition to its function ofsliding gear. I

The invention is likewise concerned with a gear change assembly, which,for obtaining direct drive and three speeds, comprises a driving shaftconnected to a driving pinion, a driven shaft in alignment with the.driving shaft and connected to an internally toothed plate, aneccentric fixed drum on which is mounted a first sliding gear having aninternal toothing constantly meshing with the toothing of the drivingpinion and an external toothing capable of engaging with the internaltoothing of the plate of the driven shaft, a sleeve for obtaining directdrive which can slide on the driven shaft and conple said shaft to thedriving shaft by interlocking with corresponding means provided at theend of the driving shaft, a countershaft parallel to the driving anddriven shafts and whereon is mounted a pinion constantly engaging withthe drivingv pinion, and a sec ond sliding gear having two externaltoothings capable of engaging respectively with a second externaltoothing on the first sliding gear and with an external toothing on theplate of the driven shaft, it being possible moreover to connect saidsecond sliding gear to the aforementioned pinion carried by saidcountershaft, means being provided for controllingthe aforementionedfirst and second sliding gears as well as the sleevesecuring directdrive and for maintaining said members in the several positions intowhich they may be brought.

Said gear box may be completed by a reverse speed device comprising asecond countershaft on which is mounted a gear train of two pinionsadapted to be brought simulta neously and respectively into engagementwith the pinion of the first counter-shaft and with the externaltoothing of the plate of the driven shaft. e

Other characteristics and peculiarities of the invention will becomeapparent from the subsequent description with reference to theaccompanying drawings in which a Fig. 1 is a longitudinal sectionalelevation (on the axis of the driving and driven shafts) of a gear boxin accordance with the invention. 1

Fig. 2 is a'corresponding cross-section on the line IIII of Fig. 1. i

Fig. 3 is another cross-section on the'line IIIIII of Fig. I and inwhich only the be of any. suitable form and 'as'sembled in any suitablemanner on the chassis of the motor VGlllClBlZO which the gear boxillustrated is supposed to be adapted.

The driving shaft 3 connected to the en gine is supported in one of thelateral cheeks of the casing 1, for example, inball-bearings 2. Saidshaft 3, which carries a driving pin ion l, has formed in its end acylindrical bore 5 in which is engaged the corresponding end of thedriven shaft 6 (or its extension) coaxial with the driving shaft 3. Thedriven shaft 6 is'likewise supported, for example by meansof ballbearings 7, in the other side cheek of the casing 1. On said drivenshaft 6 is formed a fluted portion 8 over which may slide a sleeve 9rotating with the shaft 6 and having a toothing, or dogs 10 which mayengage in a teething or in corresponding recesses 11 formed in the endof the driving pinion 4. lVith this arrangement, direct drive may beobtained in a well known manner. I

According to the invention, the gear box includes a drum l2 rigidlyfixed, as by screws 18, to one of the cheeks of the casing 1, andeccentric relative to the shafts 3 and 6. The drum 12 is hollow and thedriven shaft 6 and the driving pinion l revolve in the bore thereof.Moreover, the end of said drum is formed as a bearing 14 restingdirectly on the shaft 6, so that said drum is rigidly supported at bothends. The drum 12 supports a slid ing gear 15 loosel mounted thereon butwhich can be shifter longitudinally in a man ner presently to bedescribed, so as to bring it into predetermined positions. Said slid inggear 15 has an internal toothing 16 constantly gearing with the externaltoothing of the driving pinion l. This condition will beobservedprovided that the eccentricity of the drum 12 is equal to thatof'the two'internal and external toothings 16 and which have to mesh.Furthermore the drum12 must be cut away at 12. Moreover, at the otherend of the sliding gear 15 is formed an external teething 1' adapted toengage with the internal toothing 18 formed in a plate 19 keyed to thedriven shaft 6.

The gear box likewise includes a countershaft 20 located parallel tothe'shafts 3 and 6 and supported at both ends by thes de some particularmember.

cheeks of the casing 1. On said shaft 20 is mounted a pinion 21constantly engaging with the driving pinion l, owing to the provision ofthe cutaway portion 12 which is more clearly tobe seen in Figs. 2 and Onthe countershaft 20 is likewise loosely'inounted a second sliding gear22 including an externally toothed pinion 23 which can engage with anexternal teething 2 f on the first sliding gear15. Said second slidinggear likewise includes a second external pinion 25 having a centralneutral portion 26and which can cooperate with an external toothing 27formed on the plate 19 which-is secured to the shaft 6. The secondsliding 22 may be coupled to the pinion 21 by the clutch device 28 (dogsor ordinary teeth). In the case illustrated,it has been assum d hat thepinion 21' is keyed to th shaft 20 whereby the latter is constantlyrotated so that it may be used as desired, for example for drivingObviously, however, the gearbox would operate in identical manner if thepinion 21 were loosely mounted on the shaft 20, in which case the lattermight be held stationary. f

A system of levers of a conventional type has been illustrated intheaccompanying drawings ror controlling the longitudinal '1' displacementof the sliding gears 15 and 22.

p In the case in point, the displacement of the first sliding gear becontrolled by a fork 29 actuated by the usual gear lever 80. Accordingto the invention, the internal sleeve 9 is displaced by thesame fork 29through the medium of the first sliding gear 15. To this end, the latteran internal annular groove 31 in which engages a collar 32 carried bythe sleeve 9. The sleeve 9 thus followsevery displacement of the slidinggear 15 which thus, in addition to acting as a sliding gear, likewiseacts as a controlling member for the sleeve 9. ills for the displacementof the second slidin gear 22, it controlled by a lever 33 (Jig. pivotaly mounted at 84 and controlled at its upper T by a slide-block 3 1actuated by the lever 30. a

The above described gearbox operatesin the following manner: V v l loobtain direct dr ve, it is only necessary to displace the slit" 'ng gear15 by moving the lever- 30 so as to bring said sliding gear into itsright end position. Such displacement produces displacement to the rightof the sleeve 9, the'toothing -11) ofwhich engages in the correspondingteething 11 ofthe pinion 1. The driving shaft 3 and the driven shaft 6are thus made to rotate whole; the sliding gear 15 and the pinion21rotate idly.

For the third speed, the slidinggear 15is shifted to the left so as tocause the external toothing 17 thereof to gear with the internaltoothing 1S of the plate 19. The orive i then transmitted by the drivingpinion 4:, the

internal toothing 16, the sliding gear15, the external toothing 17, theinternal toothing 18 and the plate 19. 1 The pinion 21 rotates idly asfar as the gear changes are concerned.

For second speed, the sliding gear is left in the neutral position(position illustrated in'Fig. 1) and the lower sliding gear 22 isshifted to the left so as to cause the pinion 23 to engage with theexternal teething 24 of the sliding gear 15 and the pinion 25 (throughits right toothing) to engagewith the external toothing 27 of the plate19; The drive is then transmitted'by the pinion 4;, the internaltoothing 16, the sliding gear 15, the external toothing 24, the pinion23; the sliding gear 22, the pinion 25 and-the toothing 27; the pinion21 is again rotated but transmits no power. I

Finally, for first speed, the sliding gear 15 is again left in neutralposition and the lower sliding gear 22 is shifted to the right so as tocause the toothing 28 of the sliding gear 22 to engage with the pinion21. The effect of such displacement is simultaneously to bring thepinion 25 (through its left toothing) into gear with the toothing 27 ofthe plate 19. The drive is then transmittedflby the driving pinion 4,the pinion 21, the sliding gear 22, the pinion 25, the external toothing27 and the plate 19. The sliding'gear 15 rotates idly.

Thus, the gear box according to the invention allows direct drive andthree other speeds to be obtained, one of these speeds, the third in theexample described, being obtainedto a great extent by means ofinternally toothed gears. The gear box is of very sturdy and compactdesign owing to the provision of the eccentric drum 12 supporting thesliding gear 15.

Naturally said gear box can include a device enabling reverse speed tobe obtained. For this purpose, it is only necessary to provide, asillustrated, a second countershaft parallel to the aforementionedshafts, and on which a sliding gear '36 including pinions .37 and 38rotates loosely.- When the sliding gear 36 is shifted to the right (forexample by the lever 39 controlled by the slideblock 40 and the lever30) the pinion 38 is brought into gear with the pinion 11 and the pinion37 with the external toothing 27 of the plate 19. The direction ofrotation of the driven shaft 6 is reversed relative to that ofthe.driving shaft 3. In thisinstance, the two sliding gears 15 and 22rotate loosely without transmitting drive.

It will be. observed that the invention is not specially applicable togear boxes affording a direct drive, three other speeds,

and reverse; on the contrary, its application may be extended to allgear boxes preferably provided with a double set, of internally toothedgears for obtaining one of the speeds.

tion has only been described andillustrated here in a purely explanatorybut by no means limitative manner and that it could be subjected tomodifications in detail'withoutdeparting from the spirit thereof.

I claim r 1. In a change-speed gear, the combination.

of a driving shaft, a driven shaft, a fixed hollow drum disposedeccentrically about said driving and driven shafts, a; sliding gearsurrounding said fixed drum and continuously rotated by said drivingshaft, andcoupling means between said sliding "gear and said drivenshaft engageable with and disengageable from said sliding gear.

2. In a change-speed-gear, the combination of a driving shaft, a drivenshaft, in alignment with said driving shaft, a fixed hollow drumdisposed eccentrically about said driving and driven shafts, a slidinggear surrounding and carried by saidfixed drum, means through which saiddriving shaft continuously rotates said sliding gear, and a plurality ofmeans with which said sliding gear can be selectively engaged totransmit drive to said drivenshaft.

3. In a change-speed gear, the combination of a driving shaft, a drivenshaft, a fixed hollow drum disposed eccentrically about said driving anddriven shafts and supported at one end by said driven shaft, a casingenclosing said drum andshafts and "support ing the other end of saiddrum, a sliding gear slidably mounted on said drum, means through whichsaid driving shaft continuously rotates said sliding gear, and aplurality of means with which said sliding gear can be selectivelyengaged to transmit drive to said driven shaft. i

4. In a change-speed gear, the combination of a driving shaft, a drivenshaft in alignment with said driving shaft and journalled It is moreoverself evidentthat the inven in a bore thereof, a fixed hollow drumdisposed eccentrically about said driving and driven shafts andsupported at one end by said driven shaft, a casing enclosing said drumand shafts andsupporting the other end of said drum, a sliding gearcarried by said drum and continuously rotated by said. drivingshaft,'and a plurality of means with which said sliding gear can beselectively engaged to transmitdrive to said driven shaft. I g

5. In a change-speed gear, the combination of a driving shaft, a drivenshaft, a fixed hollow drum dispose-d eccentrically about said drivingand driven shafts, a driving pinion fast on said driving shaft, asliding gear; mounted on said fixed drum and including an internallytoothed portion, said fixed drum havinga cut-awayportion whereby saidinternally toothed portion of said sliding gear can gear with saiddriving pinion, and a plutoothedportion of said sliding gear can gearwith said driving pinion, a toothed member fast on said driven shaft,and a toothing on said sliding gear adapted to be brought into and outof engagement with said toothed member by shifting said sliding gearalong said drum.

'7. In a change-speed gear, the combination of a driving shaft, a drivenshaft, a fixed hollow drum disposed eccentricallyabout said driving anddriven shafts, and supported at one end by said driven shaft, a casingenclos ing said drum and shafts and supporting the other end of saiddrum, a dr ving pinion fast on said driving shaft, a sliding gearmounted on said fixed drum and including an internally toothed portion,said fixed drum having a cut-away portion whereby said internallytoothed portion of said sliding gear can gear with said driving pinion,an internally toothedmember fast on said driven shaft, and an externaltoothing on said slidinggear adapted to be brought into and out ofengagement with said internally toothed member by shifting said slidinggear along said drum.

8, In a change-speed gear, the combination of a driving shaft, a drivenshaft, a fixed hollow drum disposed eccentrically about said,

driving and driven shafts, an internally and externally toothed drivingpinion fast on said driving shaft, a sliding gear mounted on said fixeddrum, a sleeve feather-keyed to said driven shaft and displaceable withsaid sliding gear, a clutch member integral with said sleeve and adaptedto engage with the internal toothing of said. driving pinion upon dis-V, a placement of said sleeve whereby said driving and driven shafts aredirectly connected together, an internal toothing on said sliding gearadapted to engage continuously'with the external toothing of saiddriving pinion, an internally and externally toothed plate fast on saiddriven shaft,an external toothing on said sliding gear adapted to bebrought into and out of engagement with the internal toothing of saidplate by shifting said sliding gear along said drum, a countershaftrunning parallel to said driving and driven shafts but located outsidesaid drum,meanswhereby the countershaft is continuously driven from thedrivingshaft'and a sliding gear sliding'on said countershaft and adaptedto be brought through said toothed plate.

second sliding into engagement with the external toothing on said plateand said first sliding gear.

9. In a change-speed gear, the combination of a driving shaft, a drivenshaft, a fixed hollow drum disposed ecoentrically about said driving anddrivenshafts, and supported at one end by said driven shaft, a casingenclosing said drum and shafts and supporting the other end of saiddrum, an internally and externally toothed driving pinion fast on saiddriving shaft, a sliding gearmounted'on said fixed drum and includingan, internally toothed portion, saidfixed drum having a cutaway portionwhereby said internally toothed portion of said sliding gear can gearwith said driving pinion, a sleeve featherkeyed toisaid driven shaft anddisplace'able with said sliding gear, 'a clutch member inte gral withsaid sleeve and adapted to engage with said driving pinion upondisplacement of said sleeve whereby said driving and driven shafts aredirectly connected together, an internal toothing on said sliding gearadapted to engage continuously with the external toothing of saiddriving pinion, an internally and externally'toothed plate fast on saiddriven shaft, an external toothing on said sliding gear adapted to bebrought into and out of engagement with the internal toothing of saidplate by shifting said'sliding gear along said drum, a countershaftrunning parallel to said driving and driven shafts outside sa d drum, [asliding gear displaceable along said countershaft and adapted to bebrought into engagement with said first sliding gearand theexternaltoothing on'said plate, coupling means for continuously rotating saidcountersha-ft from said driving shaft, and a second set of gears onsaidcountershaft sliding gear adapted on predetermined displacement ofsaid second sliding gear to couple said counter-shaft to saiddrivenshaft 10. In a change-speed gear box, the, combination of a drivingshaft,gadriven shaft in alignment With said driving shaftandjournailedin a bore thereof, a drivingipinion fast on said driving shaft, a platefast on said IOU.

llO

driven shaft and including an internally and an externally toothedportion, a fixed hollow drum disposed eccentricaliy about said drivingand driven shafts, a sliding gear mounted on said fixed drum andincluding an internal ,ly toothed portion constantly gearing with pinionand w an externally,

said driving toothed portion capable of engaging: with theinternallytoothed portion of saidplate, a sleeve slidably and adapted tocouple together said driving and driven shafts, a countershaft" runningmounted on saiddrivenshaft parallel to said driving and driven shafts, a7

)lIllOIlIXlOlllltGd on said countershaft' and constantly gearing withsaid driving pinion a second external toothin g on said sliding gear, a

gearmounted-on said countershaft and including two spur wheels adaptedto gear respectively with said external toothing on said plate and saidsecond external toothing on said first sliding gear, and se- 5 lectormeans for shifting said sleeve and sliding gears.

ROBERT EMILE CHARLES DELEVOYE.

